.know-container{
    cursor:pointer;
    box-shadow: 0 2px 12px 0 rgba(0,0,0,.05);

    transition:  transform 0.5s;
}
.know-container:hover{
    transform: scale(1.1); /* 鼠标划过时放大1.1倍 */
}
.bao-icon{
    margin-right:0.3rem;
    padding: 0.5rem;
    border-radius: 10px; 
    background-color: #f0f6ff;
    height: 4rem;
    display: flex;
    align-items: center;
}
.pdf-icon{

    background-color: #ffece8;

}
.word-icon{

    background-color: #f0f6ff;

}
